Skip sync tests in Cosmos #33860
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Skip sync tests in Cosmos #33860
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Re-push of #33756
#33386 removed sync I/O support from Cosmos; the approach for the tests was to override e.g. all query tests, and introduce a special "NoSyncTest" wrapper to catch the special exception thrown when the test runs in the sync variant, and introduces is (async) checks in many tests. This forces us to deal with the sync case in each and every test.
This draft PR proposes to instead handle this via a simple [SkipSyncTests] attribute, which is used at the assembly level; if the test method being executed has a bool async parameter, and that parameter has a false argument, the test is skipped. We can then add a few targeted tests for the sync case which check that the appropriate exception is thrown.